The logic gates are basic building blocks for any digital electronic computer.
The AND, OR and NOT gates can be made from types of technology such as TTL, MOSFET, FET, or vacuum Tubes etc.
AND Gate
| A | B | output (Y = A.B) |
|---|
| 0 | 0 | 1 |
| 1 | 0 | 0 |
| 0 | 1 | 0 |
| 1 | 1 | 0 |
The truth table for AND gateOR Gate
| A | B | output (Y = A + B) |
|---|
| 0 | 0 | 0 |
| 0 | 1 | 1 |
| 1 | 0 | 1 |
| 1 | 1 | 1 |
The truth table for OR gate NOT Gate
The truth table for NOT gate
NAND Gate
| A | B | output (Y = (A.B)’ ) |
|---|
| 0 | 0 | 1 |
| 0 | 1 | 1 |
| 1 | 0 | 1 |
| 1 | 1 | 0 |
The truth table for the NAND gate NAND gate is known as a universal gate. All the other logic circuits can be derived from it.
NOR Gate
| A | B | output (Y = (A+B)’ ) |
|---|
| 0 | 0 | 1 |
| 0 | 1 | 0 |
| 1 | 0 | 0 |
| 1 | 1 | 0 |
The truth table for NOR gate NOR gate is known as a universal gate. All the other logic circuits can be derived from it.
XOR Gate
| A | B | output (Y = A’B + AB’ ) |
|---|
| 0 | 0 | 0 |
| 0 | 1 | 1 |
| 1 | 0 | 1 |
| 1 | 1 | 0 |
The truth table for XOR gate XNOR Gate
| A | B | output (Y = AB + A’B’ ) |
|---|
| 0 | 0 | 1 |
| 0 | 1 | 0 |
| 1 | 0 | 0 |
| 1 | 1 | 1 |
The truth table for XNOR gate
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